Mathmetics

ISBT Mathmetics for all banking PO,Clerk,IBPS PO,Railway,SSC,IAS,OAS Exams

Q1.
What is the value of  'P' , if the following equation has two equal roots ?
4x2 - (P-2)x + 1 = 0
1) P=6 or P=-2 2) P=4 or P=-3
3) P=6 or P=-3 4) P=4 or P=2
5)None of these
Answer : P=6 or P=-2
Explanation : Here, a=4,b= - (P-2); c=1
Given, equation  has equal roots,then D=0

b2- 4ac =0
or p2 +4 - 4p - 16 = 0
or p2- 6p +2p - 12 =0
or p(p-6) + 2(p-2) = 0
or p=6 or -2
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